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lockdep: Change hardirq{s_enabled,_context} to per-cpu variables

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Currently all IRQ-tracking state is in task_struct, this means that
task_struct needs to be defined before we use it.

Especially for lockdep_assert_irq*() this can lead to header-hell.

Move the hardirq state into per-cpu variables to avoid the task_struct
dependency.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200623083721.512673481@infradead.org
This commit is contained in:
Peter Zijlstra
2020-05-25 12:22:41 +02:00
parent a634291588
commit a21ee6055c
6 changed files with 52 additions and 43 deletions
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19
include/linux/irqflags.h
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@@ -14,6 +14,7 @@
#include <linux/typecheck.h>
#include <asm/irqflags.h>
#include <asm/percpu.h>
/* Currently lockdep_softirqs_on/off is used only by lockdep */
#ifdef CONFIG_PROVE_LOCKING
@@ -31,18 +32,22 @@
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
DECLARE_PER_CPU(int, hardirqs_enabled);
DECLARE_PER_CPU(int, hardirq_context);
extern void trace_hardirqs_on_prepare(void);
extern void trace_hardirqs_off_finish(void);
extern void trace_hardirqs_on(void);
extern void trace_hardirqs_off(void);
# define lockdep_hardirq_context(p) ((p)->hardirq_context)
# define lockdep_hardirq_context(p) (this_cpu_read(hardirq_context))
# define lockdep_softirq_context(p) ((p)->softirq_context)
# define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
# define lockdep_hardirqs_enabled(p) (this_cpu_read(hardirqs_enabled))
# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
# define lockdep_hardirq_enter() \
do { \
if (!current->hardirq_context++) \
current->hardirq_threaded = 0; \
# define lockdep_hardirq_enter() \
do { \
if (this_cpu_inc_return(hardirq_context) == 1) \
current->hardirq_threaded = 0; \
} while (0)
# define lockdep_hardirq_threaded() \
do { \
@@ -50,7 +55,7 @@ do { \
} while (0)
# define lockdep_hardirq_exit() \
do { \
current->hardirq_context--; \
this_cpu_dec(hardirq_context); \
} while (0)
# define lockdep_softirq_enter() \
do { \